Newellian Sphere. 109 
adjustment, an uniform resistance is offered, at all times, to 
the action of the moving power. The immense mechanical 
ad 
described, a weight of eight ounces, suspended at the end of 
a crank, with a three inch arm, is sufficient to put the whole 
in motion. 
In the general arrangement of the several component parts 
of the machine, all those precautions were used which wonld 
i he 
bly arose from the restrictions of the arrangement, making it 
done, and a simplicity of character and a directness 
plication maintained in the agents, so as to divest it of that 
complexness which would necessarily enhance the expense, 
and consequently diminish its usefulness. 
e yarjable motion of the earth in its elliptic orbit, caus- 
ing it to describe more days from the vernal to the autumnal 
equinox, than through the remaining portion ‘of the year, is 
uced by an unequal distribution of the cogs, or teeth, in 
the ecliptic wheel. The same variations are extended to the 
ln : 
in the same wheel, are invisible to very close observation, and 
no essential interference of the working parts is occasioned in 
consequence. The calculations are so made, likewise, that 
but two sizes of cogs are used in the wheel work of the whole. 
The train of the superior planets comprehends one division, 
and the remaining parts of the second division. The advan- 
tage of this is found in the mechanical construction. 
Extreme nicety is necessary in cutting, forming and fa- 
cing the teeth, and the artist is very evidently able to per- 
form this to greater perfection, where they are all of the same 
pattern and dimensions. 3654 solar, or 3664 siderial rota- 
tions, are given to the earth in one revolution around the sun 
